Wrench



(No Model.)

M. E. OAMPPIELD.

WRBNGH. No. 354,770. Patented Dec. 21, 1886.

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I JZMW 6622 -6 95m N. PETERS, Pholn-Uthognbher. Wishington. EC.

. UNITED STATES PATEN OFFICE.

MATTHEW E. CAMPFIELD, OF STERLING, OHIO.

WRENCH.

SPECIFICATION forming part of Letters Patent No. 354,770, dated December21, 1886.

Application filed March 25, 1886. Serial No. 196,439. (No model.)

To all whom it may concern.-

Be it known that I, MATTHEW E. CAMP- FIELD, of Sterling, in the countyof Wayne and State of Ohio, have invented certain new 5 and usefulImprovements in Wrenches, of

which the following is a specification.

This invention relates to that class of nutwrenches in which theadjustable jaw is held in position on a serrated or toothed shank by atoothed block contained within a chamber of the jaw; and it consists inthe application to said jaw and block of a lever for disengaging theblock from the toothed shank, and in the provision, hereinafterdescribed and claimed, by which the wrench may be used and adjusted withone hand.

The devices are constructed, combined, and arranged to operate ashereinafter described, and pointed out in the claims.

In the accompanying drawings, Figure l is a side elevation, partly 1nsection, of my improved wrench. Fig. 2 is an end view of the movablejaw, showing a slot for holding a thumb-lever. Fig. 3 is a detached viewof the thumb-lever. Fig. 4 is a detached view of the link that connectsa clamping-block with the interior of the movable jaw. Fig. 5 is adetached and top view of the clamping-block.

A is the shank of a wrench provided with a hammer-jaw, a. The side ofthe shank on which the jaws are located is serrated, for a purposehereinafter shown.

B is a movable jaw, fitted to slide on the shank A, and is chambered forcontaining the clamping mechanism. a

'O is a block having its lower or contact face serrated to fit theserrated side of the shank A. It has a forward extension, 0, which restson a ledge, 12, in the jaw B, and also has a recess, d, in which thelower end of a link, D, rests, connecting the block with the uppercorner of the chamber in jaw B.

E is a thumb-lever, consisting of a pin having a shoulder, c, with anextension, F. This lever E is fitted to occupy the rear portion of thechamber in-the jaw B, with its extension reaching out and back over thehandle of the wrench, the. shoulder e resting against the in-' ner endwall of the chamber. The inner end of the pin is placed in a mortiseofthe block 0, and on said pin, interposed between the in adjusting themovable, jaw or in releasing block and the shoulder e, is a spring, S,the purpose of which is to press the block down upon the shank.

From the foregoing it will be seen that by pressing on the thumb-leverwith the thumb of the-hand of the operator the block is lifted and thejaw readily shifted thereby.

The force exerted in turning a nut with this wrench causes the block 0to bear forcibly on the shank.

I am aware that it is not new to construct a wrench with a ratchetedshank ora chambered movable jaw having aserrated block connected by atoggle and operated by a pull-pin. I do not claim such in any broadsense. The pullpin must be pulled by one hand while the wrench is heldin the other hand of the operator, thus necessitating the use of bothhands it from the grip. In my device the thumb of the right hand, or thehand holding the wrench, is only needed to press upon the thumb-leverfor adjusting or releasing the movable j aw, thus leaving the other handfree.

Having described my invention, I claim- 1. In a wrench of the characterdescribed, the combination, with the serrated or toothed shank A,movable jaw B, serrated block 0, and pressure-link D, of the lever E,fulcrumed in the jaw, one end thereof engaging the block 0 and the otherextending out over the handle, whereby the thumb or finger of theholding hand of the operator may exert pressure to release the serratedblock from the shank, as and for the purposes described.

2. In a wrench of the character described, the combination, with theserrated or toothed shank A and the recessed movable jaw B, of theserrated or toothed block 0, the pressurelink D, and operating-lever E,the said block 0 having a bearing at its front end on a shoulder orledge within thejaw, and the lever being fulcrumed in the jaw, its frontend engaging the block and its rear end extending out over the handle,as and for the purpose set forth.

MATTHEIV E. GAMPFIELD.

' Witnesses:

GEO. W. TIBBITTS, E. W. LAIRlY.

